/Engine/Plugins/Animation/ControlRig/Source/ControlRig/Public/Rigs/RigHierarchy.h
Sets a curve's value given its index
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=URigHierarchy) void SetCurveValueByIndex ( int32 InElementIndex, float InValue, bool bSetupUndo )